明明是64位系统下，有16G内存，启动mysqld时指定
innodb_buffer_pool_size 为12G，却报一下错误：
080829 14:15:14 mysqld started InnoDB: HugeTLB: Warning: Failed to allocate 12884918272 bytes. errno 22 InnoDB HugeTLB: Warning: Using conventional memory pool 080829 14:15:14 InnoDB: Error: cannot allocate 12884918272 bytes of InnoDB: memory with malloc! Total allocated memory InnoDB: by InnoDB 44607312 bytes. Operating system errno: 12 InnoDB: Check if you should increase the swap file or InnoDB: ulimits of your operating system. InnoDB: On FreeBSD check you have compiled the OS with InnoDB: a big enough maximum process size. InnoDB: Note that in most 32-bit computers the process InnoDB: memory space is limited to 2 GB or 4 GB. InnoDB: We keep retrying the allocation for 60 seconds... InnoDB: Fatal error: cannot allocate the memory for the buffer pool Warning: Failed to allocate 29360128 bytes from HugeTLB memory. errno 12 Warning: Using conventional memory pool 080829 14:16:14 [Note] /usr/local/mysql/bin/mysqld: ready for connections. Version: '5.0.45-log' socket: '/home/mysql/mysql.sock' port: 3306 MySQL Community Server (GPL)
是不是很奇怪呢？
根据错误提示的内容，google一下，发现是内核限制的缘故：
根据错误提示的内容，google一下，发现是内核限制的缘故：
[root@yejr mysql]# cat /proc/sys/vm/nr_hugepages 6000
修改一下内核限制：
[root@yejr mysql]# echo 0 > /proc/sys/vm/nr_hugepages
然后重启mysql，一切正常了。
另外，还需要关注一下配置文件 /etc/security/limits.conf 里的内容。
另外，还需要关注一下配置文件 /etc/security/limits.conf 里的内容。
本文转自叶金荣51CTO博客，原文链接：http://blog.51cto.com/imysql/308833，如需转载请自行联系原作者
